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Finding the Fourth Proportional to 742.77, 1,114.56 and 255.96

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Solution

The fourth proportional to 742.77, 1,114.56 and 255.96 is: 384.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.77 : 1,114.56 = 255.96 : x
  2. Step 2: Convert to fraction form
    742.77/1,114.56 = 255.96/x
  3. Step 3: Cross multiply
    742.77x = 1,114.56 × 255.96
  4. Step 4: Simplify right side
    742.77x = 285,282.78
  5. Step 5: Solve for x
    x = 285,282.78/742.77
  6. Step 6: Final answer
    x = 384.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.